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  Re: ping at hard excel         


Author: Stan Weiss
Date: Jan 1, 2007 17:46

Degree it in straight up or retarded 2 degrees this will reduce your
dynamic compression ratio. You also should be able to see the difference
on your cranking compression it will be reduced.
Stan

hot-454@Hotmail.com wrote:
>
> i have early model 454 in a gmc pickup. I run premium gas. I have a
> compression ratio of 10.50/1 my cam is advanced 4 degrees but no
> matter how I have the timing it pings at hard excel. I have almost all
> spec for my cam size( intake lift 0.475in exh lift 0.500in)( intake
> duration 264.0 exhaust duration 274.0) my piston are 230 domed sealed
> power fordged
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  Re: ping at hard excel         


Author: Kevin Bottorff
Date: Jan 1, 2007 16:57

hot-454@Hotmail.com wrote in news:1167441997.320969.71240
@k21g2000cwa.googlegroups.com:
> i have early model 454 in a gmc pickup. I run premium gas. I have a
> compression ratio of 10.50/1 my cam is advanced 4 degrees but no
> matter how I have the timing it pings at hard excel. I have almost all
> spec for my cam size( intake lift 0.475in exh lift 0.500in)( intake
> duration 264.0 exhaust duration 274.0) my piston are 230 domed sealed
> power fordged
>
>
>

then get your dist. recurved for the eng. KB

--
Thunder Snake #9
"Protect" your rights or "lose" them.
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